Improved model predictive torque control method of NPC three-level converter-PMSM system

A technology for predicting torque and control methods, applied in motor generator control, AC motor control, electronic commutation motor control, etc. The effect of controlling performance, shortening the suppression time, and reducing the amount of calculation

Active Publication Date: 2020-04-07
ZHEJIANG UNIV
View PDF17 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods are all modulation methods, which do not consider the influence of the midpoint voltage offset on t

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Improved model predictive torque control method of NPC three-level converter-PMSM system
  • Improved model predictive torque control method of NPC three-level converter-PMSM system
  • Improved model predictive torque control method of NPC three-level converter-PMSM system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0041] Embodiments of the present invention and its implementation work process are as follows:

[0042] The specific implementation of the NPC three-level converter-PMSM system structure is as follows: figure 1 As shown, the described NPC three-level converter-PMSM system includes a voltage source, a rectifier bridge, an NPC three-level converter and a permanent magnet synchronous motor; the rectifier bridge is composed of three groups of diode groups connected in parallel, each group of diode The group is composed of two diodes in series, and the connection between the two diodes of the three groups of diodes is connected to the voltage source; the three groups of diodes are connected in parallel to output the rectified voltage V dc ; ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an improved model predictive torque control method for an NPC three-level converter-PMSM system. The method comprises: calculating an offset threshold value, dividing the midpoint voltage offset of the two direct-current support capacitors in the converter into two types of areas according to the offset threshold value: for the larger midpoint voltage offset, calculating the actual amplitude and phase of the medium and small vectors of the converter according to the current midpoint voltage offset in each sampling period, and carrying out sector dynamic division; constructing a value function and a finite control set according to the control targets of different regions, obtaining an optimal voltage vector, and outputting the optimal voltage vector; and adding deadtime to the control time corresponding to the optimal voltage vector, and outputting a PWM signal to the permanent magnet synchronous motor for control. According to the method, the torque and flux linkage control performance can be improved, the calculated amount is reduced, and the problems that in existing control, the weight coefficient setting process is complex, and the system torque, flux linkage and current control performance is reduced when the midpoint voltage deviation amplitude is large are solved.

Description

technical field [0001] The invention belongs to the field of motor control, and more specifically relates to an improved model predictive torque control method for a permanent magnet synchronous motor powered by a neutral point clamp type (NPC) three-level converter, which is used to solve the problem of neutral point voltage The problem of large torque and current fluctuations when the offset is large. Background technique [0002] Permanent magnet synchronous motor (PMSM) has the advantages of high power density, simple structure, low noise and high efficiency. Three-level converters have many advantages such as small voltage stress on single switching devices when powered by the same DC power supply, high output voltage quality, and low switching loss at the same switching frequency. Therefore, the NPC three-level converter-permanent magnet synchronous motor system is widely used in medium-high voltage and high-power motor drive applications, such as traction transmissio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02P21/05H02P21/30H02P27/12H02P27/08
CPCH02P21/05H02P27/085H02P27/12H02P21/30
Inventor 宋鹏彭世豪阎彦史婷娜夏长亮
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap